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OpenStudy (fools101):
The amount of freight transported by rail in the U.S. was about 580 billion 'ton miles' in 1960 and 830 billion in 1970. If this model held true, what was the number of 'ton miles' in 1980? (Round to the nearest billion)
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OpenStudy (fools101):
please help!
OpenStudy (karatechopper):
1080
OpenStudy (fools101):
Okay thank u!!
OpenStudy (karatechopper):
welcs
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